code: def test_datetime64tz_fillna_round_issue(self):
      # GH#14872
  
      data = Series(
          [
              NaT,
              NaT,
              datetime(
                  2016, 12, 12, 22, 24, 6, 100001, tzinfo=pytz.utc
              ),
          ]
      )
  
      filled = data.bfill()
  
      expected = Series(
          [
              datetime(
                  2016, 12, 12, 22, 24, 6, 100001, tzinfo=pytz.utc
              ),
              datetime(
                  2016, 12, 12, 22, 24, 6, 100001, tzinfo=pytz.utc
              ),
              datetime(
                  2016, 12, 12, 22, 24, 6, 100001, tzinfo=pytz.utc
              ),
          ]
      )
  
      tm.assert_series_equal(filled, expected)
  
imports: from datetime import datetime, timedelta, timezone
  import numpy
  import pytest
  import pytz
  from pandas import Categorical, DataFrame, DatetimeIndex, NaT, Period, Series, Timedelta, Timestamp, date_range, isna, timedelta_range
  import pandas._testing
  from pandas.core.arrays import period_array
label_desc: Use image node_id 9 for calling the TestFillnaPad obj's underlying member method code with example usage: obj.test_datetime64tz_fillna_round_issue() without return types