Just ran across that, so here it is.
Let’s say you want to CIFS mount a windows share — say “//server01/it stuff$”, but your Windows admin put spaces in the path.
Replace the spaces with \040.
So, in your /etc/fstab, the line would give:
//server01/it\040stuff$ /home/fblaise/mnt/MyITDrive cifs username=fblaise,password=yoursinhere,uid=1000,gid=100,_netdev 0 0
It will then work, and your linux apps which cannot see beyond your local filesystems will have a new life 😉