DepthCalculator.php

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<?php
declare(strict_types=1);

namespace Magento\CatalogGraphQl\Model\Category;

use GraphQL\Language\AST\FieldNode;

class DepthCalculator
{
    public function calculate(FieldNode $fieldNode) : int
    {
        $selections = $fieldNode->selectionSet->selections ?? [];
        $depth = count($selections) ? 1 : 0;
        $childrenDepth = [0];
        foreach ($selections as $node) {
            if ($node->kind === 'InlineFragment') {
                continue;
            }

            $childrenDepth[] = $this->calculate($node);
        }

        return $depth + max($childrenDepth);
    }
}