VFS C ++ Portable Library

Has anyone come across a good file system virtualization library that meets these requirements?

• Cross-platform: at least Win32 and Linux, preferably OSX
• Protocol Support:
  • SMB
  • FTP
  • SFTP
  • Local FS
• C ++ abstract interface with URL-based factory client:
  • SMB: // [user [: password] @] host / share / path ...
  • FTP: // [user [: password] @] host / path ...
  • SFTP: // [user [: password] @] host / path ...
  • file: // path ...
• Provide methods for:
  • A list of directories that preferably return entries with stat stat attributes.
  • Move
  • Copy
  • Delete
  • Stat
  • Bonus: low-level file access interface (open, read, write, close, ...)

, ( FTP, libssh SFTP, ), . DIY, , .