Command line sync - limit to subdirectory

Does command line sync support limiting sync to a specific subdirectory?

The command line systax I am using is:
nextcloudcmd -u nextcloud_user -p ‘password’ --trust /home/path/directory/ https://server_ip/nextcloud/

nextcloud_user is the server configured user and the root of the data
/home/path/directory/ is the local path

What happens if I add a subdirectory to both?