code: def _GetIdentifierFromPath(self, parser_mediator):
      
      file_entry = parser_mediator.GetFileEntry()
      path = file_entry.path_spec.location
      file_system = file_entry.GetFileSystem()
      path_segments = file_system.SplitPath(path)
      return path_segments[-2]
docs: Extracts a container or a graph ID from a JSON file's path.
  
      Args:
        parser_mediator (ParserMediator): mediates interactions between parsers
            and other components, such as storage and dfvfs.
  
      Returns:
        str: container or graph identifier.