Hi Fzinken! Always nice to hear from you! 
I have actually also tried this without any luck… Which is actually really weird because I have tried the guide here: Configuring fstab based Samba share mounts
I am able to connect to the server using smbclient.
This is what I have tried to insert into fstab with a credentials file.
//192.168.1.201/LaCie /home/User/HDD cifs x-systemd.automount,noauto,rw,iocharset=utf8,credentials=/home/osmc/.credentials,uid=osmc,gid=osmc,file_mode=0770,dir_mode=0770,vers=3.0 0 0
The mount doesn’t work however sudo mount -a gives no errors.