//<server>/<drive> /home/XXX/<drive> cifs credentials=/home/XXX/.credentials 0 0

username=<myusername>
password=<mypassword>

sudo mount --verbose <drive>

mount.cifs kernel mount options: ip=<myIP>,unc=\<server><drive>,user=<myusername>,pass=********
mount error(5): Input/output error
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)