First of all I replace an old HTPC with Kodi by AppleTV 4K with infuse. The application is really great.
With my Synology I create a NFS share with following settings :
Map all users to admin
Read/Write
Allow connections from non-privileged ports
Ip of the AppleTV
Two share /volume1/film and /volume2/serie
The trouble is Infuse don’t see the NFS share, I try to add manually but I think I am not using the good syntaxe (you can see a capture in enclosed document)
There is a bug in the current version which is affecting auto-detection of NFS shares, though this will be resolved in the upcoming 5.9.2 version.
For now, you may try entering the IP address (without anything after it). Once the share has been saved, you will be able to browse your NFS share and add favorite(s) for only the folders you desire.