mercurial/cext/parsers.c

--- a/mercurial/cext/parsers.c	Tue Oct 19 22:04:14 2021 +0200
+++ b/mercurial/cext/parsers.c	Thu Oct 14 13:54:39 2021 +0200
@@ -319,7 +319,9 @@
 		return NULL;
 	}
 	if ((self->flags & dirstate_flag_has_file_mtime) &&
-	    self->mtime_s == other_s && self->mtime_ns == other_ns) {
+	    self->mtime_s == other_s &&
+	    (self->mtime_ns == other_ns || self->mtime_ns == 0 ||
+	     other_ns == 0)) {
 		Py_RETURN_TRUE;
 	} else {
 		Py_RETURN_FALSE;