Filter out all keys with a specific name from all objects

[roshan-joyce-fujitsu]

Is it possible to write a filter that checks all the key names and filter out those with specific names.
For example, if the input is

{
  "id": 1,
  "name": "n1",
  "_parent": 0,
  "children" : [
    {
      "id": 11,
      "name": "n11",
      "_parent": 1,
      "children": [
        {
          "id": 111,
          "name": "n111",
          "_parent": 11
        }
      ]
    }
  ]
}

I want the output not to have "_parent" attribute. So, the output should be:

{
  "id": 1,
  "name": "n1",
  "children" : [
    {
      "id": 11,
      "name": "n11",
      "children": [
        {
          "id": 111,
          "name": "n111",
        }
      ]
    }
  ]
}

Doing the following is not working.

String filter = " .key != \"_parent\" ";
StringReader jslt = new StringReader(".");
Expression expr = new Parser(jslt).withObjectFilter(filter).compile();

return expr.apply(resultObj);

[larsga]

You can write a function which goes through the values recursively, and use

{for (.) .key : .value if (.key != "_parent")}

to do the filtering at each step.