mount resource incorrect matching

[alexpop]

As can be seen on this CentOS 7 box, /var is reported by inspec as mounted:

[1] pry(#<#<Class:0x007fe3a3ca6d48>>)> mount('/var').mounted?
=> true
[2] pry(#<#<Class:0x007fe3a3ca6d48>>)> mount('/var').options
=> ["rw", "relatime"]

This is because on this CentOS 7 box, /var matches another mount point that starts with /var:

[root@192 ~]# mount | grep -- ' on /var'
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime)

The grep filter here needs to be restricted a bit more, something like:

[root@192 ~]# mount | grep -- ' on /var type '
[root@192 ~]# mount | grep -- ' on /sys/kernel/debug type '
debugfs on /sys/kernel/debug type debugfs (rw,relatime)

Need to test this on a few supported systems.