code: def list_file_volumes(self, datacenter=None, username=None,
                            storage_type=None, **kwargs):
          
          if 'mask' not in kwargs:
              items = [
                  'id',
                  'username',
                  'capacityGb',
                  'bytesUsed',
                  'serviceResource.datacenter[name]',
                  'serviceResourceBackendIpAddress',
                  'activeTransactionCount',
                  'fileNetworkMountAddress',
                  'replicationPartnerCount'
              ]
              kwargs['mask'] = ','.join(items)
  
          _filter = utils.NestedDict(kwargs.get('filter') or {})
  
          _filter['nasNetworkStorage']['serviceResource']['type']['type'] = \
              (utils.query_filter('!~ NAS'))
  
          _filter['nasNetworkStorage']['storageType']['keyName'] = (
              utils.query_filter('*FILE_STORAGE*'))
          if storage_type:
              _filter['nasNetworkStorage']['storageType']['keyName'] = (
                  utils.query_filter('%s_FILE_STORAGE*' % storage_type.upper()))
  
          if datacenter:
              _filter['nasNetworkStorage']['serviceResource']['datacenter'][
                  'name'] = (utils.query_filter(datacenter))
  
          if username:
              _filter['nasNetworkStorage']['username'] = \
                  (utils.query_filter(username))
  
          kwargs['filter'] = _filter.to_dict()
          return self.client.call('Account', 'getNasNetworkStorage', **kwargs)
docs: Returns a list of file volumes.
  
          :param datacenter: Datacenter short name (e.g.: dal09)
          :param username: Name of volume.
          :param storage_type: Type of volume: Endurance or Performance
          :param kwargs:
          :return: Returns a list of file volumes.