code: def get_last_modified(self):
      return self._last_modified
  
imports: import os
  import pytest
  import time
  from pathlib import Path
  from parso.cache import _CACHED_FILE_MAXIMUM_SURVIVAL, _VERSION_TAG, _get_cache_clear_lock_path, _get_hashed_path, _load_from_file_system, _NodeCacheItem, _remove_cache_and_update_lock, _save_to_file_system, load_module, parser_cache, try_to_save_module
  from parso._compatibility import is_pypy
  from parso import load_grammar
  from parso import cache
  from parso import file_io
  from parso import parse
label_desc: Use image node_id 2 for calling the _FixedTimeFileIO obj's underlying member method code with example usage: obj.get_last_modified() and returns: self