Access index of the parent ng-repeat from child ng-repeat

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I want to use the index of the parent list (foos) as an argument to a function call in the child list (foos.bars).

I found a post where someone recommends using $parent.$index, but $index is not a property of $parent.

How can I access the index of the parent ng-repeat?

<div ng-repeat="f in foos">
  <div>
    <div ng-repeat="b in foos.bars">
      <a ng-click="addSomething($parent.$index)">Add Something</a>
    </div>
  </div>
</div>

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