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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def GetFileSystemTypeIndicators(cls, path_spec, resolver_context=None):
 """Determines if a file contains a supported file 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. """

    if (cls._file_system_remainder_list is None or
        cls._file_system_store is None):
      specification_store, remainder_list = cls._GetSpecificationStore(
          definitions.FORMAT_CATEGORY_FILE_SYSTEM)
      cls._file_system_remainder_list = remainder_list
      cls._file_system_store = specification_store

    if cls._file_system_scanner is None:
      cls._file_system_scanner = cls._GetSignatureScanner(
          cls._file_system_store)

    return cls._GetTypeIndicators(
        cls._file_system_scanner, cls._file_system_store,
        cls._file_system_remainder_list, path_spec,
        resolver_context=resolver_context)