code: def _GetFileSystemTypeFromFileEntry(self, file_entry):
      
      if file_entry.type_indicator != dfvfs_definitions.TYPE_INDICATOR_TSK:
        return file_entry.type_indicator
  
      # TODO: Implement fs_type in dfVFS and remove this implementation
      # once that is in place.
      file_system = file_entry.GetFileSystem()
      fs_info = file_system.GetFsInfo()
      if fs_info.info:
        type_string = '{0!s}'.format(fs_info.info.ftype)
        if type_string.startswith('TSK_FS_TYPE_'):
          type_string = type_string[12:]
        if type_string.endswith('_DETECT'):
          type_string = type_string[:-7]
  
      return type_string
docs: Retrieves the file system type indicator of a file entry.
  
      Args:
        file_entry (dfvfs.FileEntry): a file entry.
  
      Returns:
        str: file system type.