It feels to me that, at least at this stage, it’s meant more for router-to-router use, particularly for containers on diskless devices. I couldn’t get a router to mount an iSCSI target from my TrueNAS box. I tried NFS and Samba from the 2116 to my Mac too. I couldn’t get anything to work the way one would expect to another computer.
I then loaded 7.8b2 on a hAP AC3 and connected it to the 2116 using NFS and it worked immediately. However, when trying to connect the hAP to the 2116 via iSCSI, the hAP just hung. Now, even after a reboot, it hangs when trying to export or print the disk config. I can’t even remove it, so I’ll have to reset it and try again.
[Edit] Turns out NFS works with Linux and macOS, provided you have the correct options: https://forum.mikrotik.com/viewtopic.php?p=979643#p979643