Filter an array by value which is in document to filter

Question

I have these Mongoose Schemas

var UserSchema = new Schema({  
    pseudo: {type:String},
    groups: [{type:Schema.Types.ObjectId, ref:'Groups'}],
    last_messages: [{type: Number}],
});

var GroupSchema = new Schema({
    messages: [{type: Schema.Types.ObjectId, ref:'Messages'}],
    name : {type:String},
    picture: {type: String}
});

In UserSchema, last_message is linked to groups. last_message[i] contains the greatest timestamp of message received by user related to group[i]

I want to populate User by group and in Group populate Message taking only message which timestamp is greater than last_message[i] where i is the index of the group which is being populated.

How can I do that?