You can use the docker version command which gives you information about Current version of the docker installed, api version, go version and built.
[user@ankit63001 ~]$ docker images REPOSITORY TAG IMAGE ID CREATED SIZE
hello-world latest 1815c82652c0 5 days ago 1.84kB
[user@ankit63001 ~]$ docker version
Client:
Version: 17.05.0-ce
API version: 1.29
Go version: go1.7.5
Git commit: 89658be
Built: Thu May 4 22:06:25 2017
OS/Arch: linux/amd64
Server:
Version: 17.05.0-ce
API version: 1.29 (minimum version 1.12)
Go version: go1.7.5
Git commit: 89658be
Built: Thu May 4 22:06:25 2017
OS/Arch: linux/amd64
Experimental: false
[user@ankit63001 ~]$
