code: func NewEngineCommand(dockerCli command.Cli) *cobra.Command {
  	cmd := &cobra.Command{
  		Use:   "engine COMMAND",
  		Short: "Manage the docker engine",
  		Args:  cli.NoArgs,
  		RunE:  command.ShowHelp(dockerCli.Err()),
  	}
  	cmd.AddCommand(
  		newActivateCommand(dockerCli),
  		newCheckForUpdatesCommand(dockerCli),
  		newUpdateCommand(dockerCli),
  	)
  	return cmd
  }
docs: // NewEngineCommand returns a cobra command for `engine` subcommands