As my other notes are outdated, this should serve as additional information.

Installing the new Docker VM in FreeNAS 11.2 is quite straight forward, just follow the instruction from the official documentation.

Mounting, NFS shares, very easy now.

sudo su
cd /var/lib/rancher/conf/cloud-config.d/

vi nfs.yml
#cloud-config
mounts:
- ["nas.zwck.lan:/mnt/volume01/data", "/mnt/data", "nfs4", ""]
- ["nas.zwck.lan:/mnt/volume01/multimedia", "/mnt/mm", "nfs4", ""]
- ["nas.zwck.lan:/mnt/volume02/multimedia", "/mnt/mm2", "nfs4", ""]
sudo ros config validate -i nfs.yml

Check for errors reboot