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bool FilterProxyModel::filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const
{
    if (filterAcceptsRowItself(sourceRow, sourceParent))
        return true;
    //accept if any of the children is accepted on it's own merits
    if (hasAcceptedChildren(sourceRow, sourceParent)) {
        return true;
    }
    return false;
}

bool FilterProxyModel::filterAcceptsRowItself(int sourceRow, const QModelIndex &sourceParent) const
{
    QModelIndex index0 = sourceModel()->index(sourceRow, 3, sourceParent); // получаю индекс по столбцу времени после.модиф.
    QModelIndex index1 = sourceModel()->index(sourceRow, 1, sourceParent); // размер файла

    QDateTime now = QDateTime::currentDateTime();
    QDateTime fileMtime = QDateTime::fromString((sourceModel()->data(index0)).toString(),Qt::LocalDate).addYears(100);


    bool timeFilter = mdtime < fileMtime.daysTo(now);
    bool sizeFilter = filterFileSize(sourceModel()->data(index1).toString());

    return (timeFilter && sizeFilter);
}

bool FilterProxyModel::hasAcceptedChildren(int sourceRow, const QModelIndex &sourceParent) const
{
    QModelIndex item = sourceModel()->index(sourceRow,0,sourceParent);
    if (!item.isValid()) {
        //qDebug() << "item invalid" << sourceParent << sourceRow;
        return false;
    }

    //check if there are children
    int childCount = item.model()->rowCount(item);
    if (childCount == 0)
        return false;

    for (int i = 0; i < childCount; ++i) {
        if (filterAcceptsRowItself(i, item))
            return true;
        //recursive call -> NOTICE that this is depth-first searching, you're probably better off with breadth first search...
        if (hasAcceptedChildren(i, item))
            return true;
    }
    return false;
}

filterModel->setSourceModel(treemodel);
// ...
ui->treeView->setModel(filterModel);
QModelIndex ind = filterModel->mapFromSource(treemodel->setRootPath(path)); // path считывается из виджета lineEdit
if (!ind.isValid()) return;
ui->treeView->setRootIndex(ind);