function isUNC(path) {
        if (!platform_1.isWindows) {
            // UNC is a windows concept
            return false;
        }
        if (!path || path.length < 5) {
            // at least \\a\b
            return false;
        }
        var code = path.charCodeAt(0);
        if (code !== 92 /* Backslash */) {
            return false;
        }
        code = path.charCodeAt(1);
        if (code !== 92 /* Backslash */) {
            return false;
        }
        var pos = 2;
        var start = pos;
        for (; pos < path.length; pos++) {
            code = path.charCodeAt(pos);
            if (code === 92 /* Backslash */) {
                break;
            }
        }
        if (start === pos) {
            return false;
        }
        code = path.charCodeAt(pos + 1);
        if (isNaN(code) || code === 92 /* Backslash */) {
            return false;
        }
        return true;
    }
Check if the path follows this pattern: `\\hostname\sharename`.

@see https://msdn.microsoft.com/en-us/library/gg465305.aspx
@return A boolean indication if the path is a UNC path, on none-windows
always false.