How do I get the shared games?

[viweres]

I can get the owned Games that the user has

user.getUserOwnedApps([steamid], function (err, response) {
	if (err) {
		console.log(err.message);
    } else {
        console.log(response);
    }
});

but I don't get the steam family games, how can I get the shared titles,  what is the function?