I really don’t know what I was thinking after hours of searching and trying or if I was drunk when I wrote the message above. 
that doesn’t make sense because restic DOES the mount relying on fuse: since the fuse implementation on macFuse 4.2.1 is different from the one restic uses, it doesn’t work.
Anyway, based on this idea: Cannot mount on MacOS with macFUSE 4.x - #5 by cva since I’m not going to learn docker in the next few weeks, I’m trying to get a “lightweight” virtualization with mount support using https://multipass.run and ubuntu LTS and sharing mounted content via samba to Windows or macOS
I got it working and it seems pretty fast. As soon I’ll have time, I’ll try to post a tutorial, but it is really simple to get it running.
Anyway, I know that curiosity killed the cat, but I really would like to know what’s the matter about implementing restic with cgofuse