Footnote on a quotation within a quotation

What is the proper way to footnote a quotation that is within a quotation? Here is an example:

The infidel says, "There is no such substance as God." The immaterialist says, "There is such a substance as God, but it is 'without Parts.'"

The quotation, "without Parts," is a citation from a particular book, but the quote in which it appears, "There is such a substance...," is not a citation, but an assertion of what immaterialists believe. How should the "without Parts" quotation be footnoted? Should it go immediately after it, like this: "...it is 'without Parts.'<footnote>", or should it be placed completely outside any quotes, like this: "...is is 'without Parts.'"<footnote> ? Or is there a different way to do this altogether?