Remove Platform.HasSingleRootFilesystem query

src/System.Management.Automation/CoreCLR/CorePsPlatform.cs

@@ -217,18 +217,12 @@ namespace System.Management.Automation
 
         }
 
-        // Linux has a single rooted file system
-        internal static bool HasSingleRootFilesystem()
-        {
-            return !IsWindows;
-        }
-
         // Linux has no notion of file shares. It has mount points
         // instead, which are subdirectories of its single-root
         // filesystem.
         internal static bool HasFileShares()
         {
-            return !HasSingleRootFilesystem();
+            return IsWindows();
         }
 
         // Linux has no support for UNC, just mounts in a single rooted hierarchy

src/System.Management.Automation/namespaces/FileSystemProvider.cs

@@ -947,12 +947,14 @@ namespace Microsoft.PowerShell.Commands
                             root = newDrive.RootDirectory.FullName;
                         }
 
+#if LINUX
                         // Porting notes: On platforms with single root filesystems, only
                         // add the filesystem with the root "/" to the initial drive list,
                         // otherwise path handling will not work correctly because there
                         // is no : available to separate the filesystems from each other
-                        if (Platform.HasSingleRootFilesystem() && root != StringLiterals.DefaultPathSeparatorString)
+                        if (root != StringLiterals.DefaultPathSeparatorString)
                             continue;
+#endif
 
                         // Porting notes: On non-windows platforms .net can report two
                         // drives with the same root, make sure to only add one of those

src/System.Management.Automation/namespaces/LocationGlobber.cs

@@ -1589,9 +1589,12 @@ namespace System.Management.Automation
         /// </returns>
         internal static bool IsSingleFileSystemAbsolutePath(string path)
         {
-            return Platform.HasSingleRootFilesystem() &&
-                (path.StartsWith(StringLiterals.DefaultPathSeparatorString, StringComparison.Ordinal) ||
-                 path.StartsWith(StringLiterals.AlternatePathSeparatorString, StringComparison.Ordinal));
+#if LINUX
+            return path.StartsWith(StringLiterals.DefaultPathSeparatorString, StringComparison.Ordinal)
+                || path.StartsWith(StringLiterals.AlternatePathSeparatorString, StringComparison.Ordinal);
+#else
+            return false;
+#endif
         } // IsSingleFileSystemAbsolutePath
 
         /// <summary>