code: func (d *Daemon) PrependHostArg(args []string) []string {
  	for _, arg := range args {
  		if arg == "--host" || arg == "-H" {
  			return args
  		}
  	}
  	return append([]string{"--host", d.Sock()}, args...)
  }
docs: // PrependHostArg prepend the specified arguments by the daemon host flags