How to find MongoDB sub-documents with matching filtered value?

My Collection holds the structured value is

[{
   "_id"              : "....",
   "name"             : "aaaa",
   "level_max_leaves" : [
                           {
                              level      : "ObjectIdString 1",
                              max_leaves : 4,
                           },
                           {
                              level      : "ObjectIdString 2",
                              max_leaves : 6,
                           }
                        ]
},
{
   "_id"              : "....",
   "name"             : "bbbb",
   "level_max_leaves" : [
                           {
                              level      : "ObjectIdString 1",
                              max_leaves : 4,
                           },
                           {
                              level      : "ObjectIdString 4",
                              max_leaves : 3,
                           }
                        ]
}]

How I filter the level_max_leaves of level has ObjectIdString 1 value.

I need only the matching level values as ObjectIdString 1, like this

[{
   "_id"              : "....",
   "name"             : "aaaa",
   "level_max_leaves" : [
                           {
                              level      : "ObjectIdString 1",
                              max_leaves : 4,
                           }
                        ]
},
{
   "_id"              : "....",
   "name"             : "bbbb",
   "level_max_leaves" : [
                           {
                              level      : "ObjectIdString 1",
                              max_leaves : 4,
                           }
                        ]
}]

So far, I tried

MyModel.find(
              { 'level_max_leaves.level' : 'ObjectIdString 1'}, 
              null, null, 
              function(err, results){
    console.log(results);
});

This will return all the document row which has ObjectIdString 1. Also included with other sub ordinate document in an array.

But I need only the select and filtered object value when its matching.