`rsync` using `-a` parameter may cause error

The target folder to deploy on server is on NFS, so `--omit-dir-times` argument is needed ([reference](https://stackoverflow.com/questions/667992/rsync-error-failed-to-set-times-on-foo-bar-operation-not-permitted)); the owner of target folder is not me, which means I'm not allowed to change its owner, so `--owner`/`-o` argument can not be used, while `-a` includes `-rlptgoD` and causing error. Files can be synchronized correctly.

```log
rsync: failed to set times on "/home/xxx/www/blog-test/.": Operation not permitted (1)
rsync: failed to set permissions on "/home/xxx/www/blog-test/.": Operation not permitted (1)
...
Error: rsync: failed to set times on "/home/xxx/www/blog-test/.": Operation not permitted (1)
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1338) [sender=3.2.7]
```