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Filter IgxRowIsland inside Hierarchical Grid through API

I need to filter every sub grid, searching for a particular string. My app has an input and a hierarchical grid similar to the one in the following example:

For example, every album in every sub grid that contains the word "house". Is there a way to filter programatically sub grids inside the hierarchical grid? 

I've tried naming the row island and calling filter() and filterGlobal() methods with no success.