Cannot mount samba share: Mount error (22)

Try adding sec=ntlm to your option flags for mount, eg sudo mount -t cifs -o user=user,sec=ntlm //server/share /mnt/sth. Solved the same problem for me.

Source: https://bbs.archlinux.org/viewtopic.php?id=160047

try adding vers option on mount.for example:

sudo mount -t cifs -o user=user,vers=1.0 //server/share /mnt/sth

this worked for me using 4.13.4-1-ARCH