Nope. This is my experience:
When applied at the Share, filter does not complain about any special characters. From limiting testing, the following codes (8.0.0.1, 8.0.0.2, 8.0.0.3, 8.0.1.0) all appear to successfully filter .DS_Store files from being created from the Shares where the filter exists.
Notable Share Info:
-No run-as-root permissions set on share
-Domain Users : Full Control share permissions.
-Change Notify: norecurse
-File Filtering Enabled: Yes
-File Filter Extensions: DS_Store
The one caveat is that the filter does NOT work at the top level/root of the share (example: share path = /ifs/isi001/smb/IT ; .DS_Store does get created in IT directory, but filter works at /ifs/isi001/smb/IT/scripts). So recursively, the filter is working. Patches do not appear to have any impact on this behavior.
It might also be worth noting I used command line to implement:
isi smb shares modify --share=IT --file-filter-type=allow --file-filter-extensions=.DS_Store --file-filtering-enabled=yes