rsync to SAMBA share permission denied

I have a NAS that exports some directories as SAMBA shares. It works normally very well. Now I have mounted this particular share on a Linux box, using fstab. This also works. However, I would like to use rsync to download files from a server and synchronize two directories. However, I get from rsync the error message rsync: [receiver] failed to set times on "": Operation not permitted (1) so for some weird reason, he cannot set the file time. I know I can "fix" this error with the --no-times but then, the file times are not copied accordingly and, therefore, are wrong. Also it will then, I guess, cause problems with the next sync. For this reason I would like to have the times correctly set. Funny enough, if I run the same rsync command as root, setting the file times works! but it does not when it is run under another user. rsync -avz --no-perms --no-owner --no-group --no-perms --no-times --password-file ~/passwordfile.txt so it is not technically a problem of the SAMBA server, but it seems more like it is a restriction of the permissions. However, my SAMBA share is mounted with the following options cifs vers=3,rw,uid=root,gid=transfer,file_mode=0666,dir_mode=0777,credentials=/etc/my_credentials.txt so even though the owner of each file and directory is root, everybody has R/W access and therefore, in my understanding, setting the file times should work. So I don't understand why it does not work when not run as root. What is the proper fix of this?