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wp-content/plugins/canvas/gutenberg/utils/get-parent-block/index.jsx

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+/**
+ * Get parent block data.
+ *
+ * @param {Object} rootBlock root block data
+ * @param {Object} currentBlock current block data
+ * @return {Object}
+ */
+export default function getParentBlock(rootBlock, currentBlock) {
+	if (rootBlock && rootBlock.clientId === currentBlock.clientId) {
+		return rootBlock;
+	}
+
+	let result = false;
+
+	// Check all inner blocks to find parent block.
+	if (rootBlock && rootBlock.innerBlocks && rootBlock.innerBlocks.length) {
+		rootBlock.innerBlocks.forEach((innerBlockData) => {
+			const innerParent = getParentBlock(innerBlockData, currentBlock);
+
+			if (!result && innerParent) {
+				result = innerParent.clientId === currentBlock.clientId ? rootBlock : innerParent;
+			}
+		});
+	}
+
+	return result;
+}