mount fritzbox no longer works after upgrade from 14.3 to 15.1

Hi,
in 14.3 I could mount my fritzbox nas with

mount /mnt/fb

fstab has:
//fritz.box/fritz.nas /mnt/fb cifs noauto,users,uid=1000,credentials=/home/franz/.smbcredentials

after upgrade to 15.1 I get:

mount error(2): No such file or directory

what’s wrong?

//fritz.box/fritz.nas /mnt/fb cifs noauto,users,uid=1000,credentials=/home/franz/.smbcredentials

maybe vers=1.0 or 2.0 is missing?

https://wiki.samba.org/index.php/LinuxCIFSKernel#Linux_Kernel_SMB3.2FCIFS_Client

Thanks a lot!
adding vers=1.0 did the job, now it works.
Franz