docs: def cleanup_images(remove_old=False, **kwargs):
      """
      Removes all images that have no name, and that are not references as dependency by any other named image. Similar
      to the ``prune`` functionality in newer Docker versions, but supports more filters.
  
      :param remove_old: Also remove images that do have a name, but no `latest` tag.
      :type remove_old: bool
      """
      keep_tags = env.get('docker_keep_tags')
      if keep_tags is not None:
          kwargs.setdefault('keep_tags', keep_tags)
      removed_images = docker_fabric().cleanup_images(remove_old=remove_old, **kwargs)
      if kwargs.get('list_only'):
          puts('Unused images:')
          for image_name in removed_images:
              fastprint(image_name, end='\n')