Permissions when passing a NFS share to a container

[An.drea]

Hello,

the PVE system uses a NFS share. The NFS server runs openmediavault and the share uses the option no_root_squash. So the PVE server (i.e. NFS client) has write permissions.

The share is passed to an unprivileged container:
mp0: /mnt/OMV-512,mp=/mnt/OMV-512

The container can only read files.

How can I change that?

Thank you
An.drea