Sure, but that to me is not an issue of the columns (data types of each row), but rather just how you convert a path to its position within the tree, and how nodes are indented relative to each other. The columns will all have the same type, in this case text (and maybe an icon, etc.).
Put another way: you don't want to have to maintain an arbitrary number of columns, where the definition of the model changes depending on how deeply nested your directory structure is, and where each row only uses one of those many columns.
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