[JENKINS-13165] Added a test to reproduce the problem to no avail.

test/src/test/java/hudson/FileSystemProvisionerTest.java

+package hudson;
+
+import hudson.model.FreeStyleBuild;
+import hudson.model.FreeStyleProject;
+import hudson.util.StreamTaskListener;
+import org.jvnet.hudson.test.Bug;
+import org.jvnet.hudson.test.HudsonTestCase;
+
+/**
+ * @author Kohsuke Kawaguchi
+ */
+public class FileSystemProvisionerTest extends HudsonTestCase {
+    @Bug(13165)
+    public void test13165() throws Exception {
+        FreeStyleProject p = createFreeStyleProject();
+        FreeStyleBuild b = assertBuildStatusSuccess(p.scheduleBuild2(0));
+        b.getWorkspace().child(".dot").touch(0);
+        StreamTaskListener listener = StreamTaskListener.fromStdout();
+
+        WorkspaceSnapshot s = jenkins.getFileSystemProvisioner().snapshot(b, b.getWorkspace(), "**/*", listener);
+        FilePath tmp = new FilePath(createTmpDir());
+        s.restoreTo(b, tmp,listener);
+        assertTrue(tmp.child(".dot").exists());
+    }
+}