Since the root file system is marked as read-only, attempting to link the shared directory to `/vagrant` will fail. If the guest path is on the root file system and APFS is used, create the link as a firmlink instead.
Vagrant Core Plugins
These are plugins that ship with Vagrant. Vagrant core uses its own plugin system to power a lot of the core pieces that ship with Vagrant. Each plugin will have its own README which explains its specific role.