Get Available Folder Space

I need to get the available folder space that the current logged in user has for a specific directory if it happens to be limited by a network server or locally. If not limited then I need to get the available disk space (which I don't need help for). I have already looked at IDiskQuotaControl but this seems to be only good for getting the quota per volume, I need to get the quota per folder if this is at all possible.
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That's gonna be difficult, since quotas are handled on a per-volume and not a per-folder basis, see ("Managing Disk Quotas")

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