It seems that the DFSR staging folder must be on a disk volume which is mounted on a drive letter, and not a disk volume which is mounted into a directory path.
I discovered this through experience (on 2008R2), and haven't found the requirement mentioned anywhere in the documentation. I tried using a disk volume mounted on a directory path, and got lots of "The parameter is invalid" errors in the debug log file when the DFSRs.exe process attempted to open paths like "\Device\HardiskVolume1T".
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