Good file servers for Proxmox?

Hello! I have Proxmox VE running on a Dell R730 with an H730. Proxmox manages the disks in a ZFS RAID which is exactly how I want it. Because I intend for this server to have a NAS/file server, I want to set up a container or VM in proxmox that will provide network storage shares to domain-joined systems. Pretty much everything...