code: func (cli *Client) CheckpointList(ctx context.Context, container string, options types.CheckpointListOptions) ([]types.Checkpoint, error) {
  	var checkpoints []types.Checkpoint
  
  	query := url.Values{}
  	if options.CheckpointDir != "" {
  		query.Set("dir", options.CheckpointDir)
  	}
  
  	resp, err := cli.get(ctx, "/containers/"+container+"/checkpoints", query, nil)
  	defer ensureReaderClosed(resp)
  	if err != nil {
  		return checkpoints, wrapResponseError(err, resp, "container", container)
  	}
  
  	err = json.NewDecoder(resp.body).Decode(&checkpoints)
  	return checkpoints, err
  }
docs: // CheckpointList returns the checkpoints of the given container in the docker host