Mongodb : Check if a point is inside a stored polygon

I'm new to the mongodb geolocation features.

I stored some polygons that represent the country borders in a database along with the country name. Now what i would like to do is checking which country a point is in. For example if i give my own geolocation i would like to get the country where i am.

Is there a way to do it with mongodb? Maybe with geoWithin?

Thank you