In my case to use my RHEL virtual machine as development webserver, but be able to edit all files locally. I know there are other options, i.e. via sshfs and osxfuse, but NFS does support symlinks...
In your Virtual Box (application, not VM) configuration create a new Host-only network
IP4 Address: 192.168.56.1
IP4 Network Mask: 255.255.255.0
Enabled DHCP Server