return null;
        }
    }

    /**
     * Copies content from an SmbFile to a File.
     * @param src The source SmbFile.
     * @param dest The destination File.
     */
    private void copy(final SmbFile src, final File dest) {
        if (dest.exists() && !dest.canWrite()) {
            return;
        }

        map.put(FieldNames.TIMESTAMP, timestamp.toInstant().toEpochMilli());
        return map;
    }

    /**
     * Concatenates values to a destination list, avoiding duplicates.
     * @param dest The destination list.
     * @param newValues The new values to add.
     * @param <T> The type of the values.
     */
    protected static <T> void concatValues(final List<T> dest, final T... newValues) {

            return null;
        }
    }

    /**
     * Copies content from an SmbFile to a File.
     * @param src The source SmbFile.
     * @param dest The destination File.
     */
    private void copy(final SmbFile src, final File dest) {
        if (dest.exists() && !dest.canWrite()) {
            return;
        }