Space reservation and fractional reserve settings persist across reboots, takeovers, givebacks, and SnapRestore operations, provided there is enough space in the volume.
A single file SnapRestore operation on a volume maintains the fractional reserve setting of the volume and the space reservation settings of the files and LUNs in that volume. A single file SnapRestore of a file or LUN restores the space reservation setting of that file LUN, provided there is enough space in the volume.