On the Qnap

Enable NFS service in the Qnap NAS settings:

On the Linux Client

Assuming you are using Debian.

Install NFS support:

sudo apt install nfs-common

Create a mount point:

sudo mkdir -p /mnt/qnap

Mount the NFS share:

sudo mount -t nfs qnap.local:Share /mnt/qnap

To make the mount permanent edit /etc/fstab:

qnap.local:Share /mnt/qnap nfs defaults 0 0