libs/libc/time: add stub for futimes/ns(2)

Change-Id: I231817d10b9e2071b1f642e8694839b2a64b1c4c
Signed-off-by: chao.an <anchao@xiaomi.com>

include/sys/time.h

@@ -386,6 +386,49 @@ int setitimer(int which, FAR const struct itimerval *value,
 
 int utimes(FAR const char *path, const struct timeval times[2]);
 
+/****************************************************************************
+ * Name: futimes
+ *
+ * Description:
+ *  futimens() update the timestamps of a file with nanosecond precision.
+ *  This contrasts with the historical utime(2) and utimes(2), which permit
+ *  only second and microsecond precision, respectively, when setting file
+ *  timestamps. With futimens() the file whose timestamps are to be updated
+ *  is specified via an open file descriptor, fd.
+ *
+ * Input Parameters:
+ *   fd  - Specifies the fd to be modified
+ *   times - Specifies the time value to set
+ *
+ * Returned Value:
+ *   On success, futimens() return 0.
+ *   On error, -1 is returned and errno is set to indicate the error.
+ *
+ ****************************************************************************/
+
+int futimes(int fd, const struct timeval tv[2]);
+
+/****************************************************************************
+ * Name: futimes
+ *
+ * Description:
+ *  futimens() update the timestamps of a file with nanosecond precision.
+ *  This contrasts with the historical utime(2) and utimes(2), which permit
+ *  only second and microsecond precision, respectively, when setting file
+ *  timestamps.
+ *
+ * Input Parameters:
+ *   fd  - Specifies the fd to be modified
+ *   times - Specifies the time value to set
+ *
+ * Returned Value:
+ *   On success, futimens() return 0.
+ *   On error, -1 is returned and errno is set to indicate the error.
+ *
+ ****************************************************************************/
+
+int futimens(int fd, const struct timespec times[2]);
+
 /****************************************************************************
  * Name: gethrtime
  *