code: def _get_list_subfield_type(values):
      for v in values:
          if v is not None:
              return type(v)
  
      return None
  
imports: from datetime import date, datetime
  import inspect
  import json
  import numbers
  import six
  import sys
  from bson import Binary, json_util, ObjectId, SON
  import numpy
  import pytz
  import fiftyone
  import fiftyone.core.fields
  import fiftyone.core.media
  import fiftyone.core.utils
label_desc: Use image node_id 15 for calling a global function with example usage: _get_list_subfield_type(values) and returns: None, type