isNfs example

        $useBuildDir = $realBuildDir !== $realCacheDir;
        $oldBuildDir = substr($realBuildDir, 0, -1).(str_ends_with($realBuildDir, '~') ? '+' : '~');
        if ($useBuildDir) {
            $fs->remove($oldBuildDir);

            if (!is_writable($realBuildDir)) {
                throw new RuntimeException(sprintf('Unable to write in the "%s" directory.', $realBuildDir));
            }

            if ($this->isNfs($realCacheDir)) {
                $fs->remove($realCacheDir);
            } else {
                $fs->rename($realCacheDir, $oldCacheDir);
            }
            $fs->mkdir($realCacheDir);
        }

        $io->comment(sprintf('Clearing the cache for the <info>%s</info> environment with debug <info>%s</info>', $kernel->getEnvironment(), var_export($kernel->isDebug(), true)));
        if ($useBuildDir) {
            $this->cacheClearer->clear($realBuildDir);
        }