diff -Naur busybox-1.20.2/util-linux/mount.c busybox-1.20.2.patch/util-linux/mount.c
--- busybox-1.20.2/util-linux/mount.c	2012-07-02 16:08:25.000000000 +0200
+++ busybox-1.20.2.patch/util-linux/mount.c	2012-11-14 00:04:29.305472692 +0100
@@ -1804,7 +1804,7 @@
 		int len;
 		char c;
 		len_and_sockaddr *lsa;
-		char *hostname, *dotted, *ip;
+		char *hostname, *dotted, *ip, *share, *unc;
 
 		hostname = mp->mnt_fsname + 2;
 		len = strcspn(hostname, "/\\");
@@ -1812,6 +1812,15 @@
 			goto report_error;
 		c = hostname[len];
 		hostname[len] = '\0';
+
+		share = hostname + len + 1;
+		if (share[0] == '\0')
+			goto report_error;
+		// Insert "unc=\\hostname\share" option into options
+		unc = xasprintf("unc=\\\\%s\\%s", hostname, share);
+		parse_mount_options(unc, &filteropts);
+		if (ENABLE_FEATURE_CLEAN_UP) free(unc);
+
 		lsa = host2sockaddr(hostname, 0);
 		hostname[len] = c;
 		if (!lsa)