code: def detect_gpt(self, filename, offset, fs_guid):
          
          self.logger.debug('Detecting GPT partition type')
  
          if fs_guid not in self.__gpt_plugins:
              return None
          else:
              plugins = self.__gpt_plugins.get(fs_guid)
              for plugin in plugins:
                  if plugin.detect(filename, offset):
                      return plugin.get_volume_object()
  
          return None
docs: Used by rawdisk.session.Session to match gpt partitions agains
          filesystem plugins.
  
          Args:
              filename: device or file that it will read in order to detect the
              filesystem
              fs_id: filesystem guid to match
              (ex. {EBD0A0A2-B9E5-4433-87C0-68B6B72699C7})
              offset: offset for the filesystem that is being matched
  
          Returns:
              Volume object supplied by matched plugin.
              If there is no match, None is returned