If you want to use a shared mysql database for several Kodi clients that use different methods to access the shared media (e.g. a mix of SMB, NFS and/or fstab based access) you could use the path substitution function of Kodi to align the access. But watch out it is important that you only add new files to the database from a single client otherwise you would need to have different path substitutions on each client.
Please see [HowTo] Repairing File Paths with Path Substitution for details.