[{"id":0,"receiver":[1,2,3],"readBy":[{"readerId":1,"readAt":""},{"readerId":3,"readAt":""}]},{"id":1,"receiver":[1,2,3],"readBy":[{"readerId":2,"readAt":""},{"readerId":3,"readAt":""}]}]

db.collection.find([{"receiver":1,"readBy.readerId":{"$ne":1}}])