grawity/systemd-arch-units — comment on commit 0db979478588da767a2ab790f79699a2cd1287b7
File: service/rpc-idmapd.service line 9
By falconindy:

But if rpc-idmapd.service and nfsd.service are queued up at the same time, nfsd.service will always start first because of the ordering here. Why is the modprobe still necessary?