FSCTL_SET_SPARSE   50 source3/include/ntioctl.h #define FSCTL_SET_SPARSE             0x000900C4
FSCTL_SET_SPARSE   53 source4/libcli/raw/ioctl.h #define FSCTL_SET_SPARSE		(FSCTL_FILESYSTEM | FSCTL_ACCESS_ANY | 0x00C4 | FSCTL_METHOD_BUFFERED)