add missing setmtime.py

acceptance/bin/setmtime.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python3
+"""
+Cross-platform set mtime with nanosecond precision.
+Usage: setmtime.py <timestmap> <filenames>
+"""
+
+import sys
+import os
+import datetime
+
+timestamp = sys.argv[1]
+ts, ns = timestamp.split(".")
+dt = datetime.datetime.strptime(ts, "%Y-%m-%d %H:%M:%S")
+ns = int(ns.ljust(9, "0"))
+ts = int(dt.timestamp()) * 10**9 + ns
+for filename in sys.argv[2:]:
+    os.utime(filename, ns=(ts, ts))