How to not select where contain has data

I have specific task to display data in two parallel html tables. In one table must display records only if contain model not have any data, on second if contain model have data.

working example:

 $example->items = $this->Items->find()
       ->contain(['Parent']) // hasOne
                'Items.uuid' => $uuid,
                ' IS NULL', // <---- this is little hack that help us to select data only if no parent data

But how to in:

            'Example.uuid' => $uuid,
            'Example.type' => 'default',
        ->contain(['Items.Parent']) // set condition here to receive data only if Parent model not contain data???

You only want to include Items that have no Parent? Or you only want to include Examples that have Items that have no Parent?