The maximum length of a file name is 255 characters, and file names may contain any Unicode character. Case-sensitivity in file names is significant to NFS and FTP clients, but not SMB clients.
Modern Windows (CIFS/SMB) clients (NT and newer) can make full use of UCS-2 (a two byte Unicode encoding). When communicating with Windows 9x, the server uses the Latin-1 version of extended ASCII.
When communicating with NFSv2 or NFSv3 clients, the server supports the Latin-1, UTF-8, EUC-KR, EUC-JP, and EUC-CN encodings. For NFSv2 or NFSv3 clients, the Latin-1 character set is the default. When communicating with NFSv4 clients, the server supports only the UTF-8 encoding.
If you plan to have file names that include non-ASCII characters, you should change the default encoding used by the server using the protocol-character-set command.