code: @Override
      public ListFileSharesResult listFileShares(ListFileSharesRequest request) {
          request = beforeClientExecution(request);
          return executeListFileShares(request);
      }
docs: <p>
  Gets a list of the file shares for a specific file gateway, or the list of file shares that belong to the calling
  user account. This operation is only supported for file gateways.
  </p>
  
  @param listFileSharesRequest
  ListFileShareInput
  @return Result of the ListFileShares operation returned by the service.
  @throws InvalidGatewayRequestException
  An exception occurred because an invalid gateway request was issued to the service. For more information,
  see the error and message fields.
  @throws InternalServerErrorException
  An internal server error has occurred during the request. For more information, see the error and message
  fields.
  @sample AWSStorageGateway.ListFileShares
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/storagegateway-2013-06-30/ListFileShares" target="_top">AWS
  API Documentation</a>