title: filter the embedded document by each parent _id?
body: <p>I have document </p>
  
  <pre><code>{
      "_id" : ObjectId("5da832caeb173112348e509b"),
      "owner" : {
          "image" : "5d999578aeb073247de4bd6e.jpg",
          "fullname" : "hem sopheap",
          "userID" : "5d999578aeb073247de4bd6e"
      },
      "project" : {},
      "image" : "hem sopheap-1571304138866.png",
      "body" : "Lorem Ipsum "),
      "comments" : [ 
  
          {
              "user" : "5d999578aeb073247de4bd6e",
              "fullname" : "hem sopheap",
              "username" : "sopheap",
              "comment" : "1000000",
              "_id" : ObjectId("5db07900ae100b0c05b1222c"),
              "replies" : [],
              "date" : ISODate("2019-10-23T15:40:57.535Z"),
              "likes" : [ 
                  "5da85558886aee13e4e7f044", 
                  "5da85558886aee13e4e7f044", 
                  "5da85558886aee13e4e7f044", 
                  "5da85558886aee13e4e7f044", 
                  "5da85558886aee13e4e7f044", 
                  "5da85558886aee13e4e7f044", 
                  "5da85558886aee13e4e7f044", 
                  "5da85558886aee13e4e7f044", 
                  "5da85558886aee13e4e7f044", 
                  "5da85558886aee13e4e7f044", 
                  "5da85558886aee13e4e7f044"
              ]
          }, 
          {
              "user" : "5d999578aeb073247de4bd6e",
              "fullname" : "hem sopheap",
              "username" : "sopheap",
              "comment" : "11111111111",
              "_id" : ObjectId("5db0790aae100b0c05b1222d"),
              "replies" : [],
              "date" : ISODate("2019-10-23T15:40:57.535Z"),
              "likes" : []
          }
      ],
      "__v" : 33,
      "likes" : [ 
          "5d999578aeb073247de4bd6e"
      ]
  }
  </code></pre>
  
  <p>How can I get <code>likes</code>, filter by post <code>_id</code> and comments <code>_id</code> to get result <code>likes</code></p>
  
  <pre><code>"likes" : [ 
                      "5da85558886aee13e4e7f044", 
                      "5da85558886aee13e4e7f044", 
                      "5da85558886aee13e4e7f044", 
                      "5da85558886aee13e4e7f044", 
                      "5da85558886aee13e4e7f044", 
                      "5da85558886aee13e4e7f044", 
                      "5da85558886aee13e4e7f044", 
                      "5da85558886aee13e4e7f044", 
                      "5da85558886aee13e4e7f044", 
                      "5da85558886aee13e4e7f044", 
                      "5da85558886aee13e4e7f044"
                  ]
  </code></pre>