IS Comment: # This file is a comment and should not be used
NOT Comment:  # This comment has one leading space
NOT Comment:    # This comment has three leading spaces
NOT Comment: /dev/mapper/centos-var_log /var/log                xfs     defaults        1 2
NOT Comment:  /dev/donstest     /expert         none    1 1 -rw,noglob # this is a fs
NOT Comment:  #/dev/donstest22   /expert         none    1 1 -rw,noglob # this is a fS