Something new in Docker / redhat

docker@gitvmd2:~$ docker --version
Docker version 1.13.1, build 092cba3
docker@gitvmd2:~$ docker system

Usage:  docker system COMMAND

Manage Docker

Options:
      --help   Print usage

Commands:
  df          Show docker disk usage
  events      Get real time events from the server
  info        Display system-wide information
  prune       Remove unused data

Run 'docker system COMMAND --help' for more information on a command.