code: func (cli *Client) SwarmLeave(ctx context.Context, force bool) error {
  	query := url.Values{}
  	if force {
  		query.Set("force", "1")
  	}
  	resp, err := cli.post(ctx, "/swarm/leave", query, nil, nil)
  	ensureReaderClosed(resp)
  	return err
  }
docs: // SwarmLeave leaves the swarm.