What can Fiora's W block?

Been trying to test her W on everything I can since I thought it could block anything but maybe I am missing the timing on it? Mainly, can it block those mid assassins ults, such as Zed, Talon and Kat? How about Cass' ult? Is there a comprehensive list? Or maybe it is shorter/easier to list what it cannot block?{{champion:114}}
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