Unraid still supports only NFS v3 by default.
MacOS SMB is still buggy, rsync huge folders over SMB crashes finder on M1 Mac with Monterey 12.4.
Easiest to get the above combo working quickly is to set permission with insecure on unraid share(eg “192.168.0.0/16(rw,insecure)” under nfs options).
Use sudo mount_nfs -o resvport,nfsvers=3 <servername>:/mnt/user/<sharename> tempfolder on osx.