Docker and NFS Share

I am mounting my NFSv4 shares in my homelab like this:

driver_opts:
  type: nfs 
  o: addr=192.168.2.13,nfsvers=4
  device: :/volume1/Cloud/Seafile/DATA

Yaml is basicly a key/value map. A key declared more than once will either lead to a duplicate key error or one of the declaration will be used. You can not have more than one o: key.