code: def GetVolumeSystemTypeIndicators(cls, path_spec, resolver_context=None):
      
      if (cls._volume_system_remainder_list is None or
          cls._volume_system_store is None):
        specification_store, remainder_list = cls._GetSpecificationStore(
            definitions.FORMAT_CATEGORY_VOLUME_SYSTEM)
        cls._volume_system_remainder_list = remainder_list
        cls._volume_system_store = specification_store
  
      if cls._volume_system_scanner is None:
        cls._volume_system_scanner = cls._GetSignatureScanner(
            cls._volume_system_store)
  
      return cls._GetTypeIndicators(
          cls._volume_system_scanner, cls._volume_system_store,
          cls._volume_system_remainder_list, path_spec,
          resolver_context=resolver_context)
docs: Determines if a file contains a supported volume system types.
  
      Args:
        path_spec (PathSpec): path specification.
        resolver_context (Optional[Context]): resolver context, where None
            represents the built-in context which is not multi process safe.
  
      Returns:
        list[str]: supported format type indicators.