Detail:
  The SMB protocol requires the timesstamp to be in the server's timezone. The
  serverTimeZone returned by SMB_Negotiates used to convert the RISC OS
  timestamp to SMB timestamp.

  Tested by reading the filestamp of a saved file on Windows, Linux and RISC OS.
  Tested with AMU. Compiling from a Linux server AMU now sees mods to files
  made from other OS as newer.

  Note: Connecting to a local server in the winter in the UK will not exhibit
  the timestamp problem as the server timezone will be 0.

Version 2.70. Tagged as 'OmniLanManFS-2_70'