This error occurs because the version of rsync on the system cannot preserve modified times for directories.
Run rsync with the following arguments to suppress this warning:
rsync -avPO ./source/* ./destination
Explanation of switches:
a -> Archive mode (do not preserve hard links, ACLs, or extended attributes) v -> Verbose (I like to know what is happening) P -> Equivalent to --partial --progress (for long transfers that may be interrupted) O -> Omit directories from times