code: func RunPs(dockerCli command.Cli, flags *pflag.FlagSet, commonOrchestrator command.Orchestrator, opts options.PS) error {
  	return runOrchestratedCommand(dockerCli, flags, commonOrchestrator,
  		func() error { return swarm.RunPS(dockerCli, opts) },
  		func(kli *kubernetes.KubeCli) error { return kubernetes.RunPS(kli, opts) })
  }
docs: // RunPs performs a stack ps against the specified orchestrator