code: def prune_volumes(self, filters=None):
          
          params = {}
          if filters:
              params['filters'] = utils.convert_filters(filters)
          url = self._url('/volumes/prune')
          return self._result(self._post(url, params=params), True)
docs: Delete unused volumes
  
          Args:
              filters (dict): Filters to process on the prune list.
  
          Returns:
              (dict): A dict containing a list of deleted volume names and
                  the amount of disk space reclaimed in bytes.
  
          Raises:
              :py:class:`docker.errors.APIError`
                  If the server returns an error.