Config.php

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<?php
namespace Magento\Framework\DataObject\Copy;

class Config
{
    protected $_dataStorage;

    public function __construct(\Magento\Framework\DataObject\Copy\Config\Data $dataStorage)
    {
        $this->_dataStorage = $dataStorage;
    }

    public function getFieldsets($path)
    {
        return $this->_dataStorage->get($path);
    }

    public function getFieldset($name, $root = 'global')
    {
        $fieldsets = $this->getFieldsets($root);
        if (empty($fieldsets)) {
            return null;
        }
        return $fieldsets[$name] ?? null;
    }
}