Node, mongo and loop, how to break loop when I find data

My code looks similar to that:

var mongo_client = require('mongodb').MongoClient, dataStorage;
lib = {
    [...]
    find: function(res, param, callback) {
        var parentPath = param.path;

        while (parentPath !== '/') {
            collection.findOne({'paths' : parentPath}, {...}, function(err, data)) {
                if (data) {
                    dataStorage = data;
                    callback(data, res);
                }
            }
            if (dataStorage) {
                return;    
            }
            parentPath = lib.removeLastBlockOfPath(parentPath);
        }
        if (!dataStorage) {
             callback(someDefaultData, res);
        }
    }
    [...]
}

What I want to do is to find some path stored in mongo, or if there is no match, try do find first matching parent path.

I can't set dataStorage value from findOne callback is it any way to do that? Eaven if I find path it always run thru all path blocks.