SurveyMonkey: Filter get_survey_details response - php

Question

I'm trying to retrieve the responses for a particular survey from Survey Monkey using the get_responses endpoint which only retrieves the "col" and "row" ids.
{
"status": 0,
"data": [
{
"respondent_id": "4165059283",
"questions": [
{
"answers": [
{
"text": "04/11/1990",
"row": "9333771686"
}
],
"question_id": "842633241"
},
{
"answers": [
{
"row": "9333771693"
},
{
"text": "aa",
"row": "9333771691"
}
],
"question_id": "842633242"
},
{
"answers": [
{
"col": "9333771714",
"row": "9333771713"
},
{
"col": "9333771717",
"row": "9333771712"
},
{
"col": "9333771714",
"row": "9333771711"
},
{
"col": "9333771717",
"row": "9333771710"
},
{
"col": "9333771717",
"row": "9333771709"
},
{
"col": "9333771716",
"row": "9333771708"
},
{
"col": "9333771714",
"row": "9333771707"
},
{
"col": "9333771716",
"row": "9333771706"
},
{
"col": "9333771716",
"row": "9333771705"
},
{
"col": "9333771715",
"row": "9333771704"
},
{
"col": "9333771715",
"row": "9333771703"
},
{
"col": "9333771714",
"row": "9333771702"
},
{
"text": "aa",
"row": "0"
}
],
"question_id": "842633243"
},
{
"answers": [
{
"col": "9333771729",
"row": "9333771726"
},
{
"col": "9333771727",
"row": "9333771725"
},
{
"col": "9333771727",
"row": "9333771724"
},
{
"text": "aaa",
"row": "0"
}
],
"question_id": "842633244"
},
]
}
]
}
I can see that these id's correlate to a question and answer from the get_survey_details endpoint..
But how on earth do you filter the get_survey_details response to only show the question/answer that the respondent has given rather than retrieve everything? I've tried adding to the $params in the class as shown but the request still gives everything back... so clearly this isn't possible or I'm going about it in completely the wrong way:
public function getSurveyDetails($surveyId){
//original $params
//$params = array('survey_id'=>$surveyId);
$params = array(
'survey_id'=>$surveyId,
'pages'=>array(
'questions' => array (
'answers' => array (
'answer_id' => '9333771686',
)
),
)
);
return $this->run('surveys/get_survey_details', $params);
}