code: func GetCommandConnectionHelper(cmd string, flags ...string) (*ConnectionHelper, error) {
  	return &ConnectionHelper{
  		Dialer: func(ctx context.Context, network, addr string) (net.Conn, error) {
  			return commandconn.New(ctx, cmd, flags...)
  		},
  		Host: "http://docker",
  	}, nil
  }
docs: // GetCommandConnectionHelper returns Docker-specific connection helper constructed from an arbitrary command.