I have a database collection that has objects like this:

```
{
    "_id": ObjectId("something"),
    "name_lower": "total",
    "name": "Total",
    "mounts": [
        [
            "mount1",
            "instance1"
        ],
        [
            "mount2",
            "instance1"
        ],
        [
            "mount1",
            "instance2"
        ],
        [
            "mount2",
            "instance2"
        ]
    ]
}

```

Say I want to remove every mount that has the instance instance2, How would I go about doing that? I have been searching for quite a while.