code: def is_superperiod(source, target) -> bool:
      """
      Returns True if upsampling is possible between source and target
      frequencies
  
      Parameters
      ----------
      source : str or DateOffset
          Frequency converting from
      target : str or DateOffset
          Frequency converting to
  
      Returns
      -------
      bool
      """
      if target is None or source is None:
          return False
      source = _maybe_coerce_freq(source)
      target = _maybe_coerce_freq(target)
  
      if _is_annual(source):
          if _is_annual(target):
              return get_rule_month(source) == get_rule_month(target)
  
          if _is_quarterly(target):
              smonth = get_rule_month(source)
              tmonth = get_rule_month(target)
              return _quarter_months_conform(smonth, tmonth)
          return target in {
              "D",
              "C",
              "B",
              "M",
              "h",
              "min",
              "s",
              "ms",
              "us",
              "ns",
          }
      elif _is_quarterly(source):
          return target in {
              "D",
              "C",
              "B",
              "M",
              "h",
              "min",
              "s",
              "ms",
              "us",
              "ns",
          }
      elif _is_monthly(source):
          return target in {
              "D",
              "C",
              "B",
              "h",
              "min",
              "s",
              "ms",
              "us",
              "ns",
          }
      elif _is_weekly(source):
          return target in {
              source,
              "D",
              "C",
              "B",
              "h",
              "min",
              "s",
              "ms",
              "us",
              "ns",
          }
      elif source == "B":
          return target in {
              "D",
              "C",
              "B",
              "h",
              "min",
              "s",
              "ms",
              "us",
              "ns",
          }
      elif source == "C":
          return target in {
              "D",
              "C",
              "B",
              "h",
              "min",
              "s",
              "ms",
              "us",
              "ns",
          }
      elif source == "D":
          return target in {
              "D",
              "C",
              "B",
              "h",
              "min",
              "s",
              "ms",
              "us",
              "ns",
          }
      elif source == "h":
          return target in {"h", "min", "s", "ms", "us", "ns"}
      elif source == "min":
          return target in {"min", "s", "ms", "us", "ns"}
      elif source == "s":
          return target in {"s", "ms", "us", "ns"}
      elif source == "ms":
          return target in {"ms", "us", "ns"}
      elif source == "us":
          return target in {"us", "ns"}
      elif source == "ns":
          return target in {"ns"}
      else:
          return False
  
imports: from __future__ import annotations
  from typing import TYPE_CHECKING
  import numpy
  from pandas._libs import lib
  from pandas._libs.algos import unique_deltas
  from pandas._libs.tslibs import Timestamp, get_unit_from_dtype, periods_per_day, tz_convert_from_utc
  from pandas._libs.tslibs.ccalendar import DAYS, MONTH_ALIASES, MONTH_NUMBERS, MONTHS, int_to_weekday
  from pandas._libs.tslibs.dtypes import OFFSET_TO_PERIOD_FREQSTR, freq_to_period_freqstr
  from pandas._libs.tslibs.fields import build_field_sarray, month_position_check
  from pandas._libs.tslibs.offsets import DateOffset, Day, to_offset
  from pandas._libs.tslibs.parsing import get_rule_month
  from pandas.util._decorators import cache_readonly
  from pandas.core.dtypes.common import is_numeric_dtype
  from pandas.core.dtypes.dtypes import DatetimeTZDtype, PeriodDtype
  from pandas.core.dtypes.generic import ABCIndex, ABCSeries
  from pandas.core.algorithms import unique
label_desc: Use image node_id 6 for calling a global function with example usage: is_superperiod(source, target) and returns: False, unknown, unknown, _quarter_months_conform, unknown, unknown, unknown, unknown, unknown, unknown, unknown, unknown, unknown, unknown, unknown, unknown, False