Add SMB AAPL Extensions Phase 1-6 + VFS xattr support

Phase 1: AAPL Create Context negotiation
Phase 2: AFP_AfpInfo Stream structure (Finder info + creation time)
Phase 2.5: SMB Named Stream Backend (NamedStreamPath)
Phase 2.6: Backend Named Stream Support in handlers
Phase 2.7: VFS Extended Attributes (get/set/remove/list_xattr)
Phase 4: Time Machine share config (time_machine field)
Phase 5: Server/Volume Capabilities
Phase 6: macOS Unicode mapping (private range ↔ ASCII)

Tests: 174 smb-server tests pass, 52 VFS tests pass

vendor/smb-server/src/server.rs

@@ -47,6 +47,9 @@ pub struct ShareBindings {
     /// (Windows always probes IPC$ before mounting an actual share). All
     /// downstream ops on an IPC$ tree return `STATUS_NOT_SUPPORTED`.
     pub is_ipc: bool,
+    /// Time Machine support for macOS backups.
+    pub time_machine: bool,
+    pub time_machine_max_size: Option<u64>,
 }
 
 impl ShareBindings {
@@ -56,12 +59,16 @@ impl ShareBindings {
         mode: ShareMode,
         users: HashMap<String, Access>,
         is_ipc: bool,
+        time_machine: bool,
+        time_machine_max_size: Option<u64>,
     ) -> Arc<Self> {
         Arc::new(Self {
             name,
             backend,
             acl: RwLock::new(ShareAcl { mode, users }),
             is_ipc,
+            time_machine,
+            time_machine_max_size,
         })
     }
 
@@ -74,6 +81,8 @@ impl ShareBindings {
             ShareMode::PublicReadOnly,
             HashMap::new(),
             true,
+            false,
+            None,
         )
     }
 }
@@ -311,7 +320,7 @@ impl ConfigHandle {
             }
         }
 
-        let binding = ShareBindings::new(share.name, share.backend, share.mode, share.users, false);
+        let binding = ShareBindings::new(share.name, share.backend, share.mode, share.users, false, share.time_machine, share.time_machine_max_size);
         self.state.shares.insert(binding).await
     }