@thelemonalex I use native linux nfs server. Manage shares using /etc/exports file.

For SMB, I use vm with samba and mount a few folders over nfs from proxmox (it just gives me a static IP in case if I decide to change something from proxmox side).

I manage zfs on the proxmox host. I think you can't export zfs dataset to be managed by VM (except drive passthrough).

My infra has 1 proxmox bulky node with 2 HDD (zfs) and 3 nodes with small ssd/nvme in the cluster.