Add backing filesystem info to `docker info` command where applicable Fixes #9960
Add backing filesystem info to `docker info` command where applicable
Fixes #9960

This adds the output of a "Backing Filesystem:" entry to `docker info`
to overlay, aufs, and devicemapper graphdrivers. The default list
includes a fairly complete list of common filesystem names from
linux/include/uapi/linux/magic.h, but if the backing filesystem is not
recognized, the code will simply show "<unknown>"

Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>

allencloud/cli,docker/cli,Zebrilee/cli,thaJeztah/cli,riyazdf/cli,redpanda/cli,cpuguy83/cli,ashfall/cli,e11137/cli,redpanda/cli,docker/cli,e11137/cli,thaJeztah/cli,allencloud/cli,cpuguy83/cli,dnephin/cli,dnephin/cli,ashfall/cli,riyazdf/cli,Zebrilee/cli