code: def create(
      tag: t.Union[str, Tag], creation_time: t.Optional[datetime] = None
  ):
      creation_time = (
          datetime.now() if creation_time is None else creation_time
      )
      with DummyItem.store.register(tag) as path:
          dummy_fs = fs.open_fs(path)
          dummy_fs.writetext("tag", str(tag))
          dummy_fs.writetext("ctime", creation_time.isoformat())
  
imports: import os
  import sys
  import time
  import typing
  from datetime import datetime
  from typing import TYPE_CHECKING
  import attr
  import fs
  import pytest
  from bentoml import Tag
  from bentoml._internal.store import Store
  from bentoml._internal.store import StoreItem
  from bentoml.exceptions import BentoMLException
  from bentoml.exceptions import NotFound
label_desc: Use image node_id 4 for calling the DummyItem obj's underlying member method code with example usage: obj.create(tag, creation_time) without return types