You don’t need mods, it’s a DLC, not a mod.

It’s been a few months but I as far as I remember used all the same mounting options

It’s doing something different, I was using to mount an AWS FSx for ZFS share on a beefy machine (1.2GB/s network throughput) and was getting less than 50MB/s throughput using docker to mount it, but getting the full 1.2GB/s when mounted outside and mapped to a volume in the container.

I found this to be extremely underperforming. If you plan on doing anything that requires high throughput, don’t use the docker NFS operator.