rewrite SMTPFileSystem::truncate()
rewrite SMTPFileSystem::utime()
rewrite SMTPFileSystem::create()
rewrite SMTPFileSystem::open()
rewrite SMTPFileSystem::read()
rewrite SMTPFileSystem::write()
rewrite SMTPFileSystem::release()
rewrite SMTPFileSystem::opendir()
rewrite SMTPFileSystem::readdir()
rewrite SMTPFileSystem::ftruncate()
rewrite SMTPFileSystem::fgetattr()
rewrite SMTPFileSystem::rename()
rewrite SMTPFileSystem::mknod()
rewrite SMTPFileSystem::getattr()