Filesystem.Native: Fix size info for directories
Filesystem.Native: Fix size info for directories

Fabien-Chouteau/Ada_Drivers_Library,simonjwright/Ada_Drivers_Library,simonjwright/Ada_Drivers_Library,AdaCore/Ada_Drivers_Library,Fabien-Chouteau/Ada_Drivers_Library,AdaCore/Ada_Drivers_Library