Per func (c *context) , if func (c *context) resolveXAttrs returns ErrNotSupported, it should ignore that error and continue:

	base.xattrs, err = c.resolveXAttrs(fp, fi, base)
	if err != nil && err != ErrNotSupported {
		return nil, err
	}

However, func (c *context) resolveXAttrs is returning

fmt.Errorf("xattr extraction is not supported: %w", ErrNotSupported)

which is != ErrNotSupported. Instead, that should be an an errors.Is-based test.

It's probably worth checking any other == or != tests for an error against something other than nil. In just this file, I noticed errNotAHardLink might have the same issue, although a casual inspection suggests this might be okay right now as there's no fmt.Errorf calls using %w to wrap that error.

I noticed this because the Windows test runs for containerd's Snapshotter are failing with

testsuite.go:213: failure reason: failed to build manifest: failed to get resource "\\a": xattr extraction is not supported: not supported

in containerd/containerd#4419, and that "not supported" is not supposed to be a failure.