Raspberry PI 3B connecting to a Freenas Server (current software release fully updated) using a Samba Share. I have other windows 10 boxes so this is the common share method I have chosen.
I am running the latest download of OSMC and I did do an update and a dist-upgrade after installing and before configuring. I had problems connecting using fstab and autofs following the instructions as written. I did not try mounting in Kodi because I had indications the others performed better. I had direct mounts (mount.cifs and mount -t cifs) and fstab working under vanilla raspian before this, those instructions not yours called for install of smbclient, samba-common, cifs-utils and samba-common-bin. I have determined the OSMC disk image appears to contain cifs-utils and samba-common. /etc/fstab mounting is working now. In order to get it working I performed a sudo apt-get install of both smbclient and samba-common-bin and rebooted. I did this several times after several reinstalls the last time my fstab entry I believe was correct and failed before I installed smbclient and smb-common-bin (I may not need either but it works with them) and rebooted. My fstab entry did require the vers=3.02 operand. I have attempted connection using autofs without success.
I would consider doing Kodi SMB mounts if the performance issues are resolved.
This is more of a FYI at this point, as I will run for the time being using the fstab option until a comparable performing option is confirmed.
Thanks overall. OSMC is performing better than the Kodi I had under Raspian. I do like your documentation, I like the task oriented step by step nature of the instructions.
PS FYI gmail in the US puts the OSMC e-mails under a tab called promotions in the web interface. Kinda like a not quite spam directory.