stub (m|a)time_ns stat accessors

Author: timfel

graalpython/lib-graalpython/posix.py

@@ -46,6 +46,9 @@
     "st_uid", "st_gid", "st_size", "st_atime",
     "st_mtime", "st_ctime"
 ])
+stat_result.st_atime_ns = property(lambda s: int(s.st_atime * 1000))
+stat_result.st_mtime_ns = property(lambda s: int(s.st_mtime * 1000))
+
 old_stat = stat