+# ea -> none|auto|sys|ad
+# Specify how Extended Attributes are stores. default
+# is auto.
+# auto: try "sys" (by setting an EA on the shared
+# directory itself), fallback to "ad". Requires
+# writable volume for performing the test.
+# Note: options:ro overwrites "auto" with "none."
+# sys: Use filesystem EAs
+# ad: Use files in AppleDouble directories
+# none: No EA support